12109399 has 4 divisors (see below), whose sum is σ = 12172336. Its totient is φ = 12046464.

The previous prime is 12109381. The next prime is 12109411. The reversal of 12109399 is 99390121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99390121 = 19 ⋅5231059.

It is a cyclic number.

It is not a de Polignac number, because 12109399 - 2⁵ = 12109367 is a prime.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12109319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31179 + ... + 31564.

It is an arithmetic number, because the mean of its divisors is an integer number (3043084).

Almost surely, 2^12109399 is an apocalyptic number.

12109399 is a deficient number, since it is larger than the sum of its proper divisors (62937).

12109399 is an equidigital number, since it uses as much as digits as its factorization.

12109399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62936.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 12109399 is about 3479.8561751889. The cubic root of 12109399 is about 229.6364704598.

It can be divided in two parts, 1210 and 9399, that added together give a square (10609 = 103²).

The spelling of 12109399 in words is "twelve million, one hundred nine thousand, three hundred ninety-nine".